EpiFactors: a comprehensive database of human epigenetic factors and complexes. - Yulia A. Medvedeva; Andreas Lennartsson; Rezvan Ehsani; Ivan V. Kulakovskiy; Ilya E. Vorontsov; Pouda Panahandeh; Grigory Khimulya; Takeya Kasukawa; Finn Drabløs (Database J. Biol. Databases Curation, 2015)